Rohloffs 1870s Wisconsin to Kansas

My great-grandfather, William Frederick Rohloff was born in 1873 in Whitewater, Wisconsin.He married a Anna Lawrenz b.1879 in kansas. I am looking for additional information on the family of William Rohloff.I believe his parents were Johann and Sophia (Erickson). They established a Homestead Claim in 1876 near Woodbine, Kansas.Any information is appreciated.